Books held by the University of Iowa Libraries
You can use InfoHawk+ to find books, videos, journal titles, digitized objects, government resources and other materials held by the University Libraries. The default search option includes articles, which you may want to switch to books.
Books may be found in several libraries on campus. Feel free to ask for help.
The How to find materials in the Main Library (pdf) is very helpful.
How to read call numbers from the Library of Congress.
Books held by other libraries?
WorldCat is an on-line catalog that describes the holdings of most libraries in the United States, and many from other countries. If you are struggling to find what you need at Iowa, you might try WorldCat. Interlibrary Loan can help you get a copy.
Google Book has been an ambitious project to digitize books from many of the major libraries in the US and Europe. Full-text searching is available for many titles. Google Book will provide full-text of materials published before 1923, and either snippet or partial view of later material. It can be a valuable tool for the researcher. It also connects with WorldCat when you click the "Find in a library" link. Enter your zip code to get local library holdings. The University of Iowa Libraries is also a member of the HathiTrust which has taken the Google scans and created a research-oriented set of tools